Installation and operation manual
4
FXZQ20~50M8V1B
VRV System air conditioners
4PW25085-1C
■
When connecting the flare nut, coat the flare both inside and
outside with refrigerating ether or ester oil and initially tighten by
hand 3 or 4 turns before tightening firmly.
Coat here with ether oil or ester oil
■
Check the pipe connector for gas leaks, then insulate it as
shown in
■
Wrap the sealing pad only around the insulation for the joints on
the gas piping side.
■
If the refrigerant gas leaks during the work, ventilate the area. A
toxic gas is emitted by the refrigerant gas being exposed to a fire.
■
Finally make sure there is no refrigerant gas leak. A toxic gas
may be released by the refrigerant gas leaking indoor and being
exposed to flames from an area heater, cooking stove, etc.
D
RAIN
PIPING
WORK
Rig the drain piping as shown in figure and take measures against
condensation. Improperly rigged piping could lead to leaks and
eventually wet furniture and belongings.
1.
Install the drain pipes.
•
Keep piping as short as possible and slope it downwards so that
air may not remain trapped inside the pipe.
•
Keep pipe size equal to or greater than that of the connecting
pipe
(PVC pipe, nominal diameter 20 mm, outside diameter
26 mm)
.
•
Insert the drain hose into the drain socket up to the base, and
tighten the clamp securely within the portion of a grey tape.
•
Tighten the clamp until the screw head is less than 4 mm from the
hose.
•
Insulate the drain hose inside the building.
•
If the drain hose cannot be sufficiently set on a slope, fit the hose
with drain raising piping (field supply).
•
Make sure that heat insulation work is executed on the following 2
spots to prevent any possible water leakage due to dew
condensation.
•
Indoor drain pipe
•
Drain socket
•
Wrap the supplied sealing pad over the clamp and
drain hose to insulate.
How to perform piping
Precautions
■
Install the drain raising pipes at a height of less than 545 mm.
■
Install the drain raising pipes at a right angle to the indoor unit
and no more than 300 mm from the unit.
NOTE
Not recommended but in case of emergency.
You must use a torque wrench but if you are obliged to
install the unit without a torque wrench, you may follow
the installation method mentioned below.
After the work is finished, make sure to check that
there is no gas leak.
When you keep on tightening the flare nut with a
spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten
the flare nut within the angle shown below:
1
Liquid pipe
2
Gas pipe
3
Insulation for fitting of liquid line (supplied with the unit)
4
Insulation for fitting of gas line (supplied with the unit)
5
Clamps (use 2 clamps per insulation)
6
Small sealing pad (supplied with the unit)
Be sure to insulate any field piping all the way to the
piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.
Pipe size
Further
tightening angle
Recommended arm
length of tool
Ø6.4 (1/4")
60~90°
±150 mm
Ø12.7 (1/2")
30~60°
±250 mm
1
Hanging bar
2
≥
1/100 gradient
1
Metal clamp
(supplied with the unit)
2
Drain hose
(supplied with the unit)
3
Grey tape
(field supply)
1
Metal clamp (supplied with the unit)
2
Large sealing pad (supplied with the unit)
1
Ceiling slab
2
Hanger bracket
3
Drain raising pipe
4
Raising section
5
Drain hose (supplied with the unit)
6
Metal clamp (supplied with the unit)
NOTE
■
The incline of attached drain hose should be
75 mm or less so that the drain socket does not
have to stand additional force.
■
To ensure a downward slope of 1:100, install
hanging bars every 1 to 1.5 m.
■
If unifying multiple drain pipes, install the pipes as
shown in
. Select converging drain pipes
whose gauge is suitable for the operating capacity
of the unit.
1-1.5 m
1
2
2
1
3
≤
4 mm
1
2
1
T-joint converging drain pipes
